Tokuda Hospital, Sofia, Bulgaria
Fundeni Clinical Institute, Bucharest, Romania
UMHAT "St Maria", Varna, Bulgaria
The Liver Institute at Methodist Dallas, Dallas, Texas, United States
UMHAT "St Marina", Varna, Bulgaria
eStudy Site, Oceanside, California, United States
Alamo Medical Research, San Antonio, Texas, United States
Inova Center for Liver Diseases, Annandale, Virginia, United States
Henry Ford Hospital, Detroit, Michigan, United States